TRIACs

A TRIAC (triode for alternating current, also known as bidirectional triode thyristor or a bilateral triode thyristor) is a silicon semiconductor component with three terminals or legs that allow current to flow in either direction when triggered. TRIACs are a subset of thyristors and are similar to SCRs (silicon controlled rectifiers). However, unlike SCRs and other thyristors, which are unidirectional, the TRIAC is able to control current over both halves of the sine wave, making TRIACs bidirectional. A TRIAC is a 4-layer silicon component that is PNPN in the positive direction and NPNP in the negative direction. The devices come in panel mount, surface mount, and through-hole mounting options in various package types to suit a wide variety of electronics applications and circuits.RS Components have a curated range of TRIACs from a multitude of trusted brands, including Littelfuse, STMicroelectronics, WeEn Semiconductors Co., and many more.

How does a TRIAC work?

In basic terms, a TRIAC is a low-to-medium power semi-latching solid-state switch. The device acts like two standard thyristors inversely connected in parallel or back to back. To activate the component a voltage needs to be applied to the gate terminal, and TRIACs can be triggered by either negative or positive voltages, whereas SCRs require a positive voltage. Once the gate current is triggered, a TRIAC will continue to conduct even if the supply to the gate is removed.

On a TRIAC symbol, there are three terminals. These terminals are:

  • MT1 Anode 1 (Main Terminal 1)
  • MT2 Anode 2 (Main Terminal 2)
  • Gate Terminal

What are TRIACs used for?

TRIACs are widely used for switching and power control of AC systems. TRIACS are particularly useful in applications such as lighting dimmer switches, as they enable the utilisation of each half-cycle of the AC wave. The solid-state device can be used in a circuit as a simple on-off device in a wide range of electronic applications. Some of the more common areas are:

  • Temperature control
  • Liquid level control
  • Dimmers for domestic lighting
  • Small motor control
  • Speed control for electric fans

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Description Price Rated Average On-State Current Mounting Type Package Type Maximum Gate Trigger Current Repetitive Peak Reverse Voltage Surge Current Rating Pin Count Maximum Gate Trigger Voltage Repetitive Peak Forward Blocking Voltage Maximum Holding Current Dimensions Length Width Height
RS Stock No. 168-6842
Mfr. Part No.BTB06-600TRG
€0.829
Each (In a Tube of 50)
units
6A Through Hole TO-220AB 5mA 600V 63A 3 1.5V 600V 15mA 10.5 x 4.82 x 9.02mm 10.5mm 4.82mm 9.02mm
RS Stock No. 165-6742
Mfr. Part No.Z0109MN 5AA4
€0.108
Each (On a Reel of 1000)
units
1A Surface Mount SOT-223 10mA 600V 8.5A 3+Tab 1.3V - 10mA 6.7 x 3.7 x 1.8mm 6.7mm 3.7mm 1.8mm
RS Stock No. 166-1265
Mfr. Part No.BT137B-800F,118
€0.258
Each (On a Reel of 800)
units
8A Surface Mount D2PAK (TO-263) 70mA 800V 71A 3 1.5V 800V 20mA 10.3 x 9.4 x 4.5mm 10.3mm 9.4mm 4.5mm
RS Stock No. 145-8696
Mfr. Part No.ACS108-8SUN-TR
€0.161
Each (On a Reel of 1000)
units
0.8A Surface Mount SMBflat 10mA 800V - 3 1V 800V 10mA 4.6 x 3.95 x 1.1mm 4.6mm 3.95mm 1.1mm
RS Stock No. 876-5601
Mfr. Part No.ACS108-8SUN-TR
€0.363
Each (In a Pack of 20)
units
0.8A Surface Mount SMBflat 10mA 800V - 3 1V 800V 10mA 4.6 x 3.95 x 1.1mm 4.6mm 3.95mm 1.1mm
RS Stock No. 110-6594
Mfr. Part No.BTA25-800BW
€5.97
Each
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25A Through Hole RD-91 50mA 800V 260A 3 1.3V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 165-6807
Mfr. Part No.Z0109MA 5AL2
€0.151
Each (On a Reel of 2000)
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1A Through Hole TO-92 10mA - 8.5A 3 1.3V - 10mA 4.7 x 3.7 x 4.4mm 4.7mm 3.7mm 4.4mm
RS Stock No. 877-2605
Mfr. Part No.BTA10-800CWRG
€1.41
Each (In a Pack of 5)
units
10A Through Hole TO-220AB 35mA 800V 105A 3 1.3V 800V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 687-1041
Mfr. Part No.BTB16-600BWRG
€1.314
Each (In a Pack of 5)
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16A Through Hole TO-220AB 50mA 600V 168A 3 1.3V 600V 50mA 10.4 x 4.6 x 9.3mm 10.4mm 4.6mm 9.3mm
RS Stock No. 792-0759
Mfr. Part No.MAC97A8/DG,412
€0.159
Each (In a Pack of 40)
units
0.6A Through Hole TO-92 7mA 600V 8.8A 3 2V 600V 10mA 4.2 x 4.8 x 5.2mm 4.2mm 4.8mm 5.2mm
RS Stock No. 829-0633
Mfr. Part No.BTA25-600BW
€5.96
Each
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25A Panel Mount RD-91 50mA 800V 260A 3 1.3V 600V 75mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 484-2779
Mfr. Part No.BT137-600D,127
€0.57
Each (In a Pack of 5)
units
8A Through Hole TO-220AB 10mA 600V 71A 3 1.5V 600V 10mA 10.3 x 4.7 x 9.4mm 10.3mm 4.7mm 9.4mm
RS Stock No. 816-7820
Mfr. Part No.BT139-800E,127
€0.809
Each (In a Pack of 10)
units
20A Through Hole TO-220AB 25mA 800V 170A 3 1V 800V 45mA 10.3 x 4.7 x 16mm 10.3mm 4.7mm 16mm
RS Stock No. 168-8054
Mfr. Part No.T1235H-6T
€1.287
Each (In a Tube of 50)
units
12A Through Hole TO-220AB 35mA 600V 126A 3 1V 600V 35mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 169-7194
Mfr. Part No.MAC97A8/DG,412
€0.137
Each (On a Reel of 5000)
units
0.6A Through Hole TO-92 7mA 600V 8.8A 3 2V 600V 10mA 4.2 x 4.8 x 5.2mm 4.2mm 4.8mm 5.2mm
RS Stock No. 178-1394
Mfr. Part No.BTA25-600BW
€5.118
Each (In a Tube of 25)
units
25A Panel Mount RD-91 50mA 800V 260A 3 1.3V 600V 75mA 40 x 27 x 14mm 40mm 27mm 14mm
RS Stock No. 124-9962
Mfr. Part No.BTA12-600BW3G
BrandLittelfuse
€1.609
Each (In a Tube of 50)
units
12A Through Hole TO-220 50mA 600V 105A 3 1.7V 800V 50mA 10.28 x 4.82 x 15.75mm 10.28mm 4.82mm 15.75mm
RS Stock No. 168-6659
Mfr. Part No.TPDV1240RG
€8.729
Each (In a Tube of 30)
units
40A Through Hole TOP3 200mA 1200V 590A 3 1.5V 1200V - 15.5 x 4.6 x 12.85mm 15.5mm 4.6mm 12.85mm
RS Stock No. 829-0349
Mfr. Part No.BTB12-600BWRG
€1.246
Each (In a Pack of 5)
units
12A Through Hole TO-220AB 50mA 800V 126A 3 1.3V 600V 50mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm
RS Stock No. 168-8604
Mfr. Part No.T1650H-6I
€1.155
Each (In a Tube of 50)
units
16A Through Hole TO-220AB 50mA 600V 168A 3 1V 600V 75mA 10.4 x 4.6 x 15.9mm 10.4mm 4.6mm 15.9mm